<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #d1,#d2{
      border: 1px solid red;
      width: 100px;
      height: 100px;
    }

    #d1{
      margin-top: 50px;
      margin-bottom: 50px;
      margin-left: 50px;
      margin-right: 50px;
      margin: 100px;
      margin: 50px 200px;
      margin: 100px 200px 100px 200px;
    }

    #d2{
        margin-top: 150px;
        margin-bottom: 200px;
    }

    #big{
        width: 200px;
        height: 200px;
        background-color: #00ff00;
        overflow: hidden;
    }
    #big>div{
        width: 50px;
        height: 50px;
        background-color: #ff0000;
        margin-top: 100px;
    }

    #s1{
        margin-top: 10000px;
        margin-right: 50px;
    }
    #s2{
        margin-left: 50px;
    }

    h1{
        margin-top: 100px;
    }

  </style>
</head>
<body>
<div id="big">
    <div></div>
</div>

<div id="d1">div1</div>
<div id="d2">div2</div>

<h1>这是h1</h1>

<span id="s1">span1</span>
<span id="s2">span2</span>
</body>
</html>